Often we see different hand gestures symbols and assume we know what they mean. For example, giving a thumbs up we know has a very different meaning than putting your middle finger up. But there are some gestures and symbols that have had their meaning changed over time and have quite a contrasting origin to their current understanding.
The Devil Horns is when you stick up your pinky and pointer finger out which makes it look like horns but this is also known as the "rock-on" symbol or "hook 'em horns".This sign really took off when singer Ronnie James Dio started doing this in his show which then made it seem like it had a rough and rather demonic meaning. But his grandmother actually taught him this sign which is meant to ward of the evil eye which would cause bad luck. It represents the ancient mudra, Karana or "gesture of banishing."
Image Source: YouTube.com